We went on our first cruise a couple of years ago. LOVED it and want to go again.
I learned the trick to eating anything and everything and only gaining 4 pounds! WALK! I walked from one end of the ship to the other over and over and over again. Both outside and inside, up and down all the flights of stairs each time!
We had an inside room and I'm a bit claustrophobic so could only spend enough time in there to sleep at night, or change clothes.
The only thing I didn't like was the gambling area as it was the only place on the ship that smoking was allowed and I can't breath around that. So avoided that area as much as possible.
We are planning to go again - hopefully next year sometime.
Have fun and don't forget to take your camera!